A5060974266- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Geological formations and processes
- Methane Hydrates and Related Phenomena
- Paleontology and Stratigraphy of Fossils
- Marine and coastal ecosystems
- Hydrocarbon exploration and reservoir analysis
- earthquake and tectonic studies
- Nuclear Physics and Applications
- Geological and Geochemical Analysis
- Geological Studies and Exploration
- Marine Biology and Ecology Research
- Oceanographic and Atmospheric Processes
- Geomagnetism and Paleomagnetism Studies
- X-ray Spectroscopy and Fluorescence Analysis
- Tree-ring climate responses
- Education Pedagogy and Practices
- Archaeology and ancient environmental studies
- Geological and Tectonic Studies in Latin America
- Microstructure and Mechanical Properties of Steels
- Engineering Diagnostics and Reliability
- Building materials and conservation
- Linguistics and Education Research
- Plant Water Relations and Carbon Dynamics
- Climate variability and models
Universidade Estadual de Campinas (UNICAMP)
2023-2025
Universidade de São Paulo
2013-2023
Institute of Geosciences
2021
Universidade Estadual do Rio Grande do Sul
2017
Abstract Specific previous interglacial periods showed millennial‐scale climate variability that influenced deep water formation and circulation. However, our understanding about the spread of waters formed in North Atlantic throughout South during remains limited. To reconstruct geometry Meridional Overturning Circulation (AMOC) differences between Last Interglacial (LIG) Holocene, we present new authigenic neodymium isotope (ℇ Nd ) sortable silt (SS) records from middepth western Atlantic....
Abstract Modern precipitation over northeastern (NE) South America is strongly controlled by the seasonal meridional migration of Intertropical Convergence Zone (ITCZ). Ample evidence from Northern Hemisphere suggests a mid‐ to late Holocene southward ITCZ. Such shift would be expected increase semi‐arid northern NE Brazil (Southern Hemisphere). However, most robust record shows drying trend throughout Holocene. Here, we address this issue presenting high‐temporal resolution reconstruction...
We describe the characterization of a newly produced reference material, SHP2L. It is made virtually pure calcite and uniform isotopic composition, suitable for stable carbon oxygen isotope analyses.
Abstract Tropical South American hydroclimate sustains the world’s highest biodiversity and hundreds of millions people. Whitin this region, Amazonia northeastern Brazil have attracted much attention due to their high biological social vulnerabilities climate change (i.e. considered hotspots). Still, future response remains uncertain. On precession timescale, it has been suggested that periods decreased western Amazonian precipitation were accompanied by increased Brazilian vice-versa,...
Abstract Magnetic signals in deep‐sea sediments have the potential to unravel past continental environmental changes, via changes primary terrigenous magnetic supply, but also record marine conditions, situ formation of secondary minerals, particularly when complemented by independent proxies. By combining environmagnetic, geochemical, and siliciclastic grain size data, we investigated sediment core GL‐1090 (24.92°S, 42.51°W, 2,225 m water depth) aiming input bottom conditions during last...
Abstract Negative excursions in the stable carbon isotopic composition (δ 13 C) at Atlantic intermediate to mid‐depths are common features of millennial‐scale events named Heinrich Stadials. The mechanisms behind these not yet fully understood, but most hypotheses agree on central role played by weakening meridional overturning circulation. Marine records registering negative δ C mostly restricted Stadials last deglacial, while glacial poorly studied. Here, we constrain changes bottom water...
Abstract Subtropical ocean gyres play a key role in modulating the global climate system redistributing energy between low and high latitudes. A poleward displacement of subtropical has been observed over last decades, but lack long-term monitoring data hinders an in-depth understanding their dynamics. Paleoceanographic records offer opportunity to identify meridional changes investigate consequences system. Here we use abundance planktonic foraminiferal species Globorotalia truncatulinodes...
Abstract. Abrupt millennial-scale climate change events of the last deglaciation (i.e. Heinrich Stadial 1 and Younger Dryas) were accompanied by marked increases in atmospheric CO2 (CO2atm) decreases its stable carbon isotopic ratios (δ13C), i.e. δ13CO2atm, presumably due to outgassing from ocean. However, information on preceding Stadials during glacial period is scarce. Here we present δ13C records two species planktonic foraminifera western South Atlantic that reveal major (up ‰) 3 2....
Abstract. Abrupt millennial–scale climate change events of the last deglaciation (i.e., Heinrich Stadial 1 and Younger Dryas) were accompanied by marked increases in atmospheric CO2 presumably originated outgassing from Southern Ocean. However, information on preceding Stadials during glacial period is scarce. Here we present stable carbon isotopic data (δ13C) two species planktonic foraminifera western South Atlantic that reveal major decreases (up to ‰) 3 2. These δ13C are most likely...
An X-ray fluorescence standardised inert dilution method has been developed for the determination of silica in quartz-sand, glass and cementclinker samples.By using fused sample technique, can be applied satisfactorily (standard deviation 0·7 per cent.) to rapid routine silica.The results determinations quartz sand are compared with those obtained by four different chemical methods.